HP 70000 series, User Manual

Page: 110 / 447

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AMPCOR -> UPPER
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AMPCOR On Off
Apply amplitude correction at specied frequencies .
Use AMPCOR to compensate for frequency-dependent amplitude variations at the input port.
P airs of frequency-amplitude correction points can be entered, depending on the amount of
available internal memory . The frequency values entered must be equal or be in increasing
order , or an error condition results . Whenever AMPCOR is on, the correction values are added
to all measurement results .
The values of the correction points are applied across the active measurement range . Between
points , the correction values are interpolated. When measuring at frequencies outside the rst
and last correction points , these values are used as the correction value .
When AMPCOR is executed, the frequency-amplitude pairs are stored in internal memory .
DISPOSE ALL , FORMA T , and PERASE erase the amplitude-correction pairs from memory .
Because AMPCOR adjusts IF gain or attenuation, AMPCOR should be used with care when
measuring signals near the compression level that are also at a frequency that is corrected by
the AMPCOR command.
Functional Type:
amplitude
Firmkey A ccess:
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Amptd
Preset State:
O
a
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AMPCOR -> UPPER
(amplitude corrections -> upper limit line) stores amplitude correction values as a upper limit
line .
The amplitude corrections must rst be entered into the upper limit-line table , using the
limit-line softkey functions . The limit line is then stored as amplitude-correction values , using
the
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UPPER-> AMPCOR softkey .
After the correction values are stored in the limit-line table , they can be modied, using the
appropriate limit-line softkey functions .
Use the
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UPPER-> AMPCOR softkey to store and enable the amplitude-correction values .
Softkey Descriptions 4-15